Me neither, that's why I wrote that someone claimed that they did.
The idea is simple, in a way, with diffusion several sentences / words get predicted, but they usually are not of great quality. With auto regression they select the correct words.
Increasing quality and speed. Sounds a bit like conscious and sub-conscious to me.
We are not at the end of AI :)
Also, someone claimed that NVIDA combined diffusion and autoregression, making it 6 times faster, but couldn't find a source. Big if true!